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If the target CPA is competitive enough, then either your quality scores are not good enough or the targeting is too tight which may be limiting the number of eligible impressions.
Check what the average quality scores are for your keywords, they should at least be 7 to have a better ad rank & drive more traffic to the ads.
But if your impression share is already high enough (70-80% range), look towards expanding your targeting. For that, you need to add more number of keywords, widen the ad schedule & select more audience segments etc. This can do the trick if you don’t wanna switch to broad match keywords.
Also, make sure you don’t have any negative bid adjustments in device, location etc & the audience targeting is set to **observation mode** to expand on the traffic
Go through the negative list once as well to see if you have added any relevant terms that might be blocking your impressions
